Controlling the growth of Si/Ge nanowires and heterojunctions using silver-gold alloy catalysts

Yi-Chia Chou, Cheng Yen Wen, Mark C. Reuter, Dong Su, Eric A. Stach*, Frances M. Ross

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

61 Scopus citations

Abstract

We describe a new catalyst for group IV nanowire heterostructures, based on alloying Ag with Au, that combines the ability to control catalyst phase and nanowire structure with good environmental stability. Compared to other alloy catalysts, we show a higher oxidation resistance of AgAu and more consistent crystal shapes and catalyst/nanowire orientation relationships during growth. We show that AgAu catalysts are also stable against diffusion during growth, making them capable of forming long nanowires with uniform diameters. Furthermore, we demonstrate the growth of compositionally abrupt Si/Ge heterojunctions with good reproducibility and yield, switching individual nanowires between vapor-liquid-solid and vapor-solid-solid growth to optimize growth rates by control of the catalyst state. The stability and properties of AgAu catalysts potentially open up a promising and practical route toward control of group IV heterostructure nanowires.

Original languageEnglish
Pages (from-to)6407-6415
Number of pages9
JournalACS Nano
Volume6
Issue number7
DOIs
StatePublished - 24 Jul 2012

Keywords

  • AgAu alloys
  • in situ transmission electron microscopy
  • nanowire growth
  • Si/Ge heterojunctions
  • vapor-solid-solid growth

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